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Cash Dividends (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Dividends Payable [Line Items]
Cash dividends paid, per share	$ 0.04	$ 0.02	$ 0.06	$ 0.04
Cash dividends paid			$ 13,275	$ 7,595
Installment 1, FY 2018
Dividends Payable [Line Items]
Cash dividends paid, date			Mar. 22, 2018
Cash dividends paid, per share			$ 0.02
Cash dividends paid			$ 4,443
Installment 2, FY 2018
Dividends Payable [Line Items]
Cash dividends paid, date			Jun. 21, 2018
Cash dividends paid, per share			$ 0.04
Cash dividends paid			$ 8,832
Installment 1, FY 2017
Dividends Payable [Line Items]
Cash dividends paid, date				Mar. 22, 2017
Cash dividends paid, per share				$ 0.02
Cash dividends paid				$ 3,326
Installment 2, FY 2017
Dividends Payable [Line Items]
Cash dividends paid, date				Jun. 22, 2017
Cash dividends paid, per share				$ 0.02
Cash dividends paid				$ 4,269

X

- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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- Definition

Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

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+ References

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